# Characteristic Numbers of Suspended Sediment Concentration (independent of tides)

### From BAWiki

A graphic sketch for the definition of the various tidal characteristic numbers of suspended sediment concentration is not available. Due to the fact that they are defined in complete analogy to salinity we do refer here to the respective graphical representations of the characteristic numbers of salinity (independent of tides) for further insight.

## Motivation

Calculation and graphic display of several tide-independent characteristic numbers of suspended sediment concentration can yield additional insight into suspended sediment concentration related phenomena of natural coastal and/or inland waters. In contrast to the computation of the tidal characteristic numbers of suspended sediment concentration the tide-independent numbers can be preferable used for

- natural waters which are not dominated by the tides, e.g. like the coastal waters and estuaries along the Baltic Sea coast of Germany, or in
- extreme situations, like for example periods of high or low fresh water runoff, when suspended sediment concentration may deviate strongly from the average (tide-dominated) conditions, as well as for the
- determination of characteristic values of suspended sediment concentration for an arbitrary long (or short) period of time.

In particular there are several useful applications possible for this type of data analysis:

- In addition to informations about the highest and lowest suspended sediment concentration values which occur during an arbitrary period one can calculate also the maximum suspended sediment concentration difference for this time span. This is a good indicator for the natural variability of suspended sediment concentration.
- Maximum values for the (rate of) increase and (rate of) decrease of suspended sediment concentration are an additional measure for the characterization of e.g. extreme runoff situations.
- From the computed times for the duration of high suspended sediment concentration and the duration of low suspended sediment concentration one can draw conclusions with respect to the impact of suspended sediment concentration on organisms living in the water or along the beaches.
- The variance of the time-dependent suspended sediment concentration evolution with respect to mean suspended sediment concentration can be used as an indicator for the dynamics of a natural water system.

**An automatic analysis of all tide-independent characteristic numbers of suspended sediment concentration is carried through by the computer programs LZKSF and NCANALYSE.**

## Definitions for the tide-independent characteristic numbers of suspended sediment concentration

### Program NCANALYSE

#### Maximum Value of Suspended Sediment (HSus)

Highest (local) value of suspended sediment within the period of data analysis.

Example figure: maximum value of suspended sediment.

Data analysis: NCANALYSE.

#### Maximum valid value of Suspended Sediment

Highest valid (local) value of suspended sediment within an arbitrary period of time, computed out of a time serie which may contain invalid data due to different reasons (drying, instrument failure, etc.).

Data analysis: NCANALYSE.

#### Minimum Value of Suspended Sediment (NSus)

Lowest (local) value of suspended sediment within the period of data analysis.

Example figure: minimum value of suspended sediment.

Data analysis: NCANALYSE.

#### Minimum valid value of Suspended Sediment

Lowest valid (local) value of suspended sediment within an arbitrary period of time, computed out of a time serie which may contain invalid data due to different reasons (drying, instrument failure, etc.).

Data analysis: NCANALYSE.

#### Mean Value of Suspended Sediment

Mean value of suspended sediment within the period of data analysis.

Example figure: mean value of suspended sediment.

Data analysis: NCANALYSE.

#### Maximum Suspended Sediment Difference

Difference in suspended sediment between maximum and minimum value within the period of data analysis.

Example figure: maximum suspended sediment difference.

Data analysis: NCANALYSE.

#### Standard Deviation of Suspended Sediment

Standard deviation of suspended sediment within the period of data analysis.

Computed for permanently flooded areas only.

Example figure: standard deviation of suspended sediment.

Data analysis: NCANALYSE.

#### Variance of Suspended Sediment

Variance of suspended sediment within the period of data analysis.

Computed for permanently flooded areas only.

Example figure: variance of suspended sediment.

Data analysis: NCANALYSE.

#### Duration of High Suspended Sediment

Time span for which suspended sediment lies *above* a certain threshold within an arbitrary period of time.

Example figures: duration of high suspended sediment.

Data analysis: NCANALYSE.

#### Duration of Low Suspended Sediment

Time span for which suspended sediment lies *below* a certain threshold within an arbitrary period of time.

Example figures: duration of low suspended sediment.

Data analysis: NCANALYSE.

#### Relative Frequency Distribution of Suspended Sediment

Relative frequency of suspended sediment within given suspended sediment intervals.

Example figures: relative frequency distribution of suspended sediment.

Data analysis: NCANALYSE.

#### Cumulative Frequency Distribution of Suspended Sediment

Cumulative frequency of suspended sediment within given suspended sediment intervals.

Example figures: cumulative frequency distribution of suspended sediment.

Data analysis: NCANALYSE.

#### Exceedance Frequency of Suspended Sediment Limits

Exceedance frequency of suspended sediment limits within the period of data analysis.

Example figures: exceedance frequency of suspended sediment limits.

Data analysis: NCANALYSE.

#### Underflow Frequency of Suspended Sediment Limits

Underflow frequency of suspended sediment limits within the period of data analysis.

Example figures: underflow frequency of suspended sediment limits.

Data analysis: NCANALYSE.

#### Quantiles of Suspended Sediment

suspended sediment value of a time series which is not exceeded of a certain percentage of suspended sediment values in the serie.

Computed for permanently flooded areas only.

- a) Example figure: median of suspended sediment Q_0.50
- b) Example figures: quantiles of suspended sediment Q_0.01, Q_0.05, Q_0.95, Q_0.99

Data analysis: NCANALYSE.

### Program LZKSF

#### Maximum Value of Suspended Sediment Concentration

Highest value of suspended sediment concentration within an arbitrary period of time.

Example: not available.

#### Minimum Value of Suspended Sediment Concentration

Lowest value of suspended sediment concentration within an arbitrary period of time.

Example: not available.

#### Mean Value of Suspended Sediment Concentration

Arithmetic mean of suspended sediment concentration for an arbitrary period of time. Example: not available.

#### Maximum Suspended Sediment Concentration Difference

Difference in suspended sediment concentration between highest and lowest suspended sediment concentration for an arbitrary period of time.

Example: not available.

#### Maximum (Rate of) Increase of Suspended Sediment Concentration

Maximum increase of suspended sediment concentration (within one hour) within an arbitrary period of time.

Example: not available.

#### Maximum (Rate of) Decrease of Suspended Sediment Concentration

Maximum decrease of suspended sediment concentration (within one hour) within an arbitrary period of time.

Example: not available.

#### Standard Deviation of Suspended Sediment Concentration

Standard deviation of suspended sediment concentration with respect to the mean value of suspended sediment concentration within an arbitrary period of time.

Example: not available.

#### Variance of Suspended Sediment Concentration

Variance of suspended sediment concentration with respect to the mean value of suspended sediment concentration within an arbitrary period of time.

Example: not available.

#### Duration of High Suspended Sediment Concentration

Period of time during which suspended sediment concentration lies above a specific threshold for suspended sediment concentration.

Example: not available.

#### Duration of Low Suspended Sediment Concentration

Period of time during which suspended sediment concentration lies below a specific threshold for suspended sediment concentration.

Example: not available.

#### Advective Transport of Suspended Load

Volume of suspended sediment, which is transported through a cross section over a period of time.

Example: not available.

#### Mean Advective Suspended Load Transport

Mean value of suspended sediment transport within a period of time.

Example: not available.

#### Maximum Advective Suspended Load Transport

Highest value of suspended sediment transport within a period of time.

Example: not available.

#### Minimum Advective Suspended Load Transport

Lowest value of suspended sediment transport within a period of time.

Example: not available.

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